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Index › Programming Questions & Help › Integration › Problem starting an application in a jar
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Problem starting an application in a jar (Read 524 times)
mcam
Problem starting an application in a jar
Dec 8th, 2008, 1:34pm  
Hello

My application that embeds PAppet works OK when invoked with

java -classpath XXX mapackage.MyApp

However, it stops working when I pack my classes into a jar file and invoke the application like this

java -classpath XXX -jar myapp.jar.

There is no problem with the jar file, ie without the PApplet embedded the application starts up OK.  If I interprest the error message correctly, the problem seem to be that PApplet cannot find the main class despite the fact that the jar file with the main class is on the classpath.

Any suggestions will be appreciated

The error folows below:

Exception in thread "main" java.lang.NoClassDefFoundError: processing/core/PApplet
       at java.lang.ClassLoader.defineClass1(Native Method)
       at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
       at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
       at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
       at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
       at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
       at java.security.AccessController.doPrivileged(Native Method)
       at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
       at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
       at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Caused by: java.lang.ClassNotFoundException: processing.core.PApplet
       at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
       at java.security.AccessController.doPrivileged(Native Method)
       at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
       at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
       at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
       ... 12 more
Could not find the main class: npgviz.npgviewer.NpgVizFrame. Program will exit.
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PhiLho 
Re: Problem starting an application in a jar
Reply #1 - Dec 8th, 2008, 2:05pm  
What is XXX? Is core.jar in it?
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mcam
Re: Problem starting an application in a jar
Reply #2 - Dec 8th, 2008, 2:43pm  
Yes, the core .jar is in it
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